Issue 10, 2023

High-performance asymmetric supercapacitor device with nickel–cobalt bimetallic sites encapsulated in multilayered nanotubes

Abstract

Enhanced faradaic capacitance can be achieved by using a metallic heterostructure as a result of the intrinsic activity of the electrodes. Optimizing the multimetallic heterostructure is key to improving the intrinsic activity of the electrodes. Herein, a consolidated strategy of a multimetallic design with predominantly nickel, cobalt, and zinc centers on multiwalled nanotubes was developed via pyrolysis of a trimetallic metal–organic framework at 800 °C. The resulting C-ZIF-800 material offers a multiwalled nanotube-like structure that facilitates the encapsulation of multimetallic sites with predominantly nickel and cobalt centers on a nanotube-like N–C interface. XRD, HRTEM, XPS, and EXAFS spectroscopic analysis support the metallic valence state of the Ni and Co centers encapsulated in the N–C nanotubes. C-ZIF-800 offers an outstanding specific capacitance of 849.47 F g−1 at a current density of 1 A g−1. Based on three-electrode electrochemical measurements, an asymmetric supercapacitor (ASC) device (C-ZIF-800//AC) was fabricated with a wide potential window of 1.7 V. The device offers an excellent specific capacity of 599.7 C g−1 at 0.25 A g−1 with an exceptional energy density of 141.59 W h kg−1 at a power density of 212.5 W kg−1, and remaining 4250 W kg−1 after retaining 81.93 W h kg−1 of energy density. The as-fabricated device demonstrated its excellent potential for future energy storage applications by illuminating a red LED light for 60 min by combining two devices in series.

Graphical abstract: High-performance asymmetric supercapacitor device with nickel–cobalt bimetallic sites encapsulated in multilayered nanotubes

Supplementary files

Article information

Article type
Paper
Submitted
13 May 2023
Accepted
10 Aug 2023
First published
10 Aug 2023
This article is Open Access
Creative Commons BY license

Energy Adv., 2023,2, 1650-1659

High-performance asymmetric supercapacitor device with nickel–cobalt bimetallic sites encapsulated in multilayered nanotubes

R. Patil, L. Pradhan, B. M. Matsagar, O. Agrawal, K. C.-W. Wu, B. K. Jena and S. Dutta, Energy Adv., 2023, 2, 1650 DOI: 10.1039/D3YA00206C

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